Kunz, R. M. (1971). The challenge of life. Switzerland: Basel and Stutgart.
Trích dẫn kiểu ChicagoKunz, Robert M. The Challenge of Life. Switzerland: Basel and Stutgart, 1971.
MLA引文Kunz, Robert M. The Challenge of Life. Switzerland: Basel and Stutgart, 1971.
警告：這些引文格式不一定是100％准確.